divide 5x^3-13x^2+15x+7 by 5x+2
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5x+2[5x³-13x²+15x+7](x²-3x+4)=quotient
_5x³+_2x²
- 15x²+15x
-15x²-6x
+. +
21x+7
20x+8
- -
x-1=remainder
_5x³+_2x²
- 15x²+15x
-15x²-6x
+. +
21x+7
20x+8
- -
x-1=remainder
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